* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body,html {
    width: percentage(1);
    height: percentage(1);
    overflow: hidden;
    background: url("~/header_bg.jpg") no-repeat center / cover;
}
.#{$prefix}clearfix::after {
    @include setProperty(content,'');
    @include setProperty(display,table);
    @include setProperty(clear,both);
}
ul,li {
    @include setProperty(list-style,none);
}
.app {
    @include setProperty(position,absolute);
    @include setProperty(width,percentage(1));
    @include setProperty(height,percentage(1));
}